Spark plug



Sept. 10, 1929. E. A. BARNETT SPARK PLUG Filed Dec. 4, 1924 gwuentox Patented Sept. 10, 1929.

EDWARD ALFRED BARNETT, QIE FOR-'1 ARTHUR, TEXAS.

SPARK PLUG.

Application filed December 4, 1924.

My invention relates to improvements in spar: plugs and the main object is the provision of a spark plug which ,will absolutely prevent the entrance of moisture to the contact portions of the device and thus insure reliable and efiicient operation of the spark plug.

Another object of my invention is the provision of means to prevent the contact portions of the spark plug from becoming damp or wet, such means being capable oi application to spark plugs in general use or at the time of manufacture and at a very small cost.

Another object of my invention is the provision of a spark plug which will prove highly eflicient and desirable under all climatic or weather conditions, which will prevent to a great extent the gathering of carbon and which generally will prove highly desirable and practical.

With these objects in view, my invention consists of a spark plug embodying novel features of construction and arrangement of parts for service, substantially as described and claimed, and as shown in the accompanying drawing, in which:

Figure 1 represents a side elevation of a spark plug constructed in accordance with and embodying my invention.

Fig. 2 represents a side elevation of the spark plug, with the features constituting my invention shown in section, and

Fig. 3 represents a view showing the spark plug proper in elevation and the Parts which form my invention detached and in perspective.

My improvement is capable of use in spark plugs in common and general use or in any other spark plug using a shell A, a porcelain B, and electrode C, formed on the shell and an electrode D, passing through the porcelain and formed with the upper threaded end E, my invention being used upon said upper threaded end, and consisting of the series of rings or washers F, of a suitable non-absorbent material, the series of interposed washers G, of increased size and of suitable non-absorbent material and the protecting cap or hood H.

Serial No. 753,841.

This construction and its arrangement is clearly shown in Fig. 2, and upon the stem and resting on the hood is the sealing asher or ring J, above which and screwed upon the threaded end E, is the metal'ring K and the binding cap L, between said members K and L, the wire being secured in the usual manner.

From this construction it will be apparent that I provide means which will absolutely prevent the entrance of moisture or damp-'- ness to the contact portion of the spark plug and also that the hood extending over the outline of the shell of the plug will carry away any moisture which might contact with said hood, thus the plug will be what might be termed moisture or dampness proof, which will prove of great merit and advantage to users of automobiles.

From the foregoing description, taken in connection with the drawing, it will be in-' stantly apparent that my improvements may be used upon practically all spark plugs in use and adapted to others at the time of manufacture at a very small cost, and that it will prove so desirable and of such great advantage as to make its use a practical necessity.

It will be noted that the washers while of and practically non-absorbent material have a suiiicient amount of absorbency to actto retard the moisture or water and prevent it from contact with the metal elements Off the spark plug and the washers are made in different sizes to provide a greater area or exposure to moisture to insure more perfect retarding or preventing of the moisture from contact with the metal element, or in other words, present a larger surface over which the moisture or water would be obliged to travel, and this forms a most important feature of my invention.

The most important advantage gained by my invention, is the ittCb that it practically makes impossible the entrance of moisture to the metal parts or electrodes oi my spark plug, for it will be noted that should a drop of water contact with the cap L, it will travel down over the ring R, and be directed by the sealing washer J, to the hood H, and pass thence down the flange of the hood, and thence to the loWer Washer G, and upward, and in this Way the course of travel would make it impossible for said drop of Water to contact With the upper portion of the electrode D, and this arrangement of the cap, ring, sealing Washer, hood and the graduated spaced Washers makes it impossible for Water or moisture to reach the electrode, and thus 10 the spark plug is proof against moisture.

I claim:

A device of the character described, comprising an electrode, a series of insulating washers on said electrode, alternate Washers 5 oi said series being substantially larger in diameter than the Washers next adjacent thereto, a protecting hood on said electrode above said series of Washers having a greater diameter than any of said Washers and having a skirt depending from its outer edge, so as to completely surround said Washers, a sealing element on said electrode above saidhood, and a binding nut on said electrode above said hood.

In testimony whereof I hereunto affix my signature.

EDWARD ALFRED BARNETT. 

